✅Answer: Regarding a traveler leading prayer for residents, the following narrations have been reported:

بِإِسْنَادِهِ عَنْ سَعْدٍ عَنْ أَبِی جَعْفَرٍ یَعْنِی أَحْمَدَ بْنَ مُحَمَّدِ بْنِ عِیسَی عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِی نَصْرٍ عَنْ دَاوُدَ بْنِ الْحُصَیْنِ عَنْ أَبِی الْعَبَّاسِ الْفَضْلِ بْنِ عَبْدِ الْمَلِکِ عَنْ أَبِی عَبْدِ اللَّهِ قَالَ لَا یَؤُمُّ الْحَضَرِیُّ الْمُسَافِرَ وَ لَا الْمُسَافِرُ الْحَضَرِیَّ فَإِنِ ابْتُلِیَ بِشَیْ ءٍ مِنْ ذَلِکَ فَأَمَّ قَوْماً حَضَرِیِّینَ فَإِذَا أَتَمَّ الرَّکْعَتَیْنِ سَلَّمَ ثُمَّ أَخَذَ بِیَدِ بَعْضِهِمْ فَقَدَّمَهُ فَأَمَّهُمْ....

📚Man La Yahduruhu Al-Faqih, Vol. 1, p. 398

Translation:

دَعَائِمُ الْإِسْلَامِ، عَنْ عَلِيٍّ فِي خَبَرٍ أَنَّهُ قَالَ لَا يَؤُمُّ الْمُسَافِرُ الْمُقِيمِينَ

Imam Sadiq (AS) said: 'A resident (who prays in full) should not lead prayer for a traveler, and a traveler (who prays a shortened prayer) should not lead prayer for a resident. However, if a person finds themselves in such a situation and a traveler becomes the congregational leader for residents praying in full, when the traveler completes their two rak'ahs, they should say the final salam and bring one of the followers forward to lead the remaining part of the prayer.'

وَ عَنْ أَبِي جَعْفَرٍ وَ أَبِي عَبْدِ اللَّهِ أَنَّهُمَا قَالا لَا يَنْبَغِي لِلْمُسَافِرِ أَنْ يُصَلِّيَ بِمُقِيمٍ وَ لَا يَأْتَمُّ بِهِ فَإِنْ فَعَلَ فَأَمَّ بِمُقِيمِينَ سَلَّمَ مِنْ رَكْعَتَيْنِ وَ أَتَمُّوا هُمْ وَ إِنِ ائْتَمَّ بِمُقِيمِينَ انْصَرَفَ مِنْ رَكْعَتَيْنِ

📚Mustadrak Al-Wasa'il, Vol. 6, p. 466

Translation:

It is narrated from Imam Ali (AS) that he said: 'A traveler should not lead prayer for residents.'